LVM（Logical Volume Manager）的精简卷（Thinly-Provisioned Logical Volumes）是一种高效的存储管理技术，它允许存储管理员创建逻辑卷，这些逻辑卷的大小可以远超过底层物理存储的实际容量。这种技术通过“精简池”（Thin Pool）来实现，精简池是一个特殊的逻辑卷，用于动态地管理分配给精简卷的空间。
在测试的服务器上新增了一块10G的磁盘，将这个磁盘创建为一个thinpool和2个5G的逻辑卷。它看起来应该这样做：
一、创建精简卷
1.创建pv
[root@shizhanxia.com ]# pvcreate /dev/sdc Physical volume "/dev/sdc" successfully created.
2.创建vg
[root@shizhanxia.com ]# vgcreate data /dev/sdc Volume group "data" successfully created
3.创建ThinPool
[root@shizhanxia.com ]# lvcreate -l +100%free --thinpool data_pool data Thin pool volume with chunk size 64.00 KiB can address at most 15.81 TiB of data. Logical volume "data_pool" created.
4.创建精简卷Thin volume
[root@shizhanxia.com ]# lvcreate -V 5G --thin -n thin_lv_data01 data/data_pool Logical volume "thin_lv_data01" created. [root@shizhanxia.com ]# lvcreate -V 5G --thin -n thin_lv_data02 data/data_pool WARNING: Sum of all thin volume sizes (10.00 GiB) exceeds the size of thin pool data/data_pool and the size of whole volume group (<10.00 GiB). WARNING: You have not turned on protection against thin pools running out of space. WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full. Logical volume "thin_lv_data02" created.
5.创建完成，查看效果。
[root@shizhanxia.com ]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert data_pool data twi-aotz-- 9.97g 0.00 0.68 thin_lv_data01 data Vwi-a-tz-- 5.00g data_pool 0.00 thin_lv_data02 data Vwi-a-tz-- 5.00g data_pool 0.00 root rhel -wi-ao---- 149.50g swap00 swapvg -wi-ao---- <8.00g
二、lVM精简卷thin pool的自动扩容
1.默认自动扩展配置
默认情况下，自动扩展名设置为”100”
[root@shizhanxia.com ]# grep thin_pool_autoextend_threshold /etc/lvm/lvm.conf # Configuration option activation/thin_pool_autoextend_threshold. # thin_pool_autoextend_threshold = 70 thin_pool_autoextend_threshold = 100
设置为100将禁用自动扩展，默认设置表明该功能已被禁用。activation / thin_pool_autoextend_threshold表明当精简池的使用率超过此百分比时会自动扩展。
2.启用自动扩展
如果启用自动扩展请同时更改”thin_pool_autoextend_percent”和”thin_pool_autoextend_threshold”，如下所示：
[root@shizhanxia.com ]# grep thin_pool_autoextend_threshold /etc/lvm/lvm.conf thin_pool_autoextend_threshold = 70 thin_pool_autoextend_percent = 20
这意味着，只要池使用率超过70％，它就会再扩展20％。
三、LVM精简卷thin volume手动扩容
LVM精简卷thin volume手动扩容，扩容步骤如下：
1.查看LVM状态
[root@shizhanxia.com ]# pvs /dev/sdc data lvm2 a-- <15.00g 5.00g [root@shizhanxia.com ]#vgs VG #PV #LV #SN Attr VSize VFree data 1 3 0 wz--n- <15.00g 5.00g [root@shizhanxia.com ]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert data_pool data twi-aotz-- 9.97g 0.00 0.68 thin_lv_data01 data Vwi-a-tz-- 5.00g data_pool 0.00 thin_lv_data02 data Vwi-a-tz-- 5.00g data_pool 0.00 root rhel -wi-ao---- 149.50g swap00 swapvg -wi-ao---- <8.00g
2.扩容thin pool
[root@shizhanxia.com ]# lvextend -L +2G data/data_pool Size of logical volume data/data_pool_tdata changed from 9.97 GiB (2553 extents) to 11.97 GiB (3065 extents). Logical volume data/data_pool_tdata successfully resized.
3.扩容thin volume
[root@shizhanxia.com ]# lvextend -L +2G data/thin_lv_data01 WARNING: Sum of all thin volume sizes (12.00 GiB) exceeds the size of thin pool data/data_pool and the amount of free space in volume group (3.00 GiB). WARNING: You have not turned on protection against thin pools running out of space. WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full. Size of logical volume data/thin_lv_data01 changed from 5.00 GiB (1280 extents) to 7.00 GiB (1792 extents). Logical volume data/thin_lv_data01 successfully resized.
原创文章，作者：保哥，如若转载，请注明出处：https://www.shizhanxia.com/1537.html
微信扫一扫 
支付宝扫一扫 
